U880
Encyclopedia
8-bit
The first widely adopted 8-bit microprocessor was the Intel 8080, being used in many hobbyist computers of the late 1970s and early 1980s, often running the CP/M operating system. The Zilog Z80 and the Motorola 6800 were also used in similar computers...
microprocessor
Microprocessor
A microprocessor incorporates the functions of a computer's central processing unit on a single integrated circuit, or at most a few integrated circuits. It is a multipurpose, programmable device that accepts digital data as input, processes it according to instructions stored in its memory, and...
manufactured in the German Democratic Republic
German Democratic Republic
The German Democratic Republic , informally called East Germany by West Germany and other countries, was a socialist state established in 1949 in the Soviet zone of occupied Germany, including East Berlin of the Allied-occupied capital city...
. It was manufactured in NMOS logic
NMOS logic
N-type metal-oxide-semiconductor logic uses n-type metal-oxide-semiconductor field effect transistors to implement logic gates and other digital circuits...
technology and encased in a DIL40
Dual in-line package
In microelectronics, a dual in-line package is an electronic device package with a rectangular housing and two parallel rows of electrical connecting pins. The package may be through-hole mounted to a printed circuit board or inserted in a socket.A DIP is usually referred to as a DIPn, where n is...
package.
The U880 CPU was used between 1980 and 1989 in the KC 85
KC 85
The KC 85 were models of microcomputers built in East Germany, first in 1984 by Robotron and later by VEB Mikroelektronik "Wilhelm Pieck" Mühlhausen ....
/2, KC 85/3 and KC 85/4 computers (manufactured by VEB Mikroelektronik "Wilhelm Pieck" Mühlhausen), in the Z1013 (manufactured by Robotron Riesa), Robotron A 5120, 1715 and also in other office and amateur computers in the GDR.
The U880 is an almost identical copy of Zilog
Zilog
Zilog, Inc., previously known as ZiLOG , is a manufacturer of 8-bit and 24-bit microcontrollers, and is most famous for its Intel 8080-compatible Z80 series.-History:...
's 8-bit Z80
Zilog Z80
The Zilog Z80 is an 8-bit microprocessor designed by Zilog and sold from July 1976 onwards. It was widely used both in desktop and embedded computer designs as well as for military purposes...
microprocessor. Differences include absence of CY flag setting in OUTI command (when L goes zero) and another behaviour of hidden bus register seen through undocumented F3 and F5 flags. Russian КР1858ВМ1 chips work the same way as U880.
The U880 was developed and manufactured as a non-licensed reproduction by VEB Mikroelektronik "Karl Marx" (Erfurt
Erfurt
Erfurt is the capital city of Thuringia and the main city nearest to the geographical centre of Germany, located 100 km SW of Leipzig, 150 km N of Nuremberg and 180 km SE of Hannover. Erfurt Airport can be reached by plane via Munich. It lies in the southern part of the Thuringian...
). A pin and function-compatible CMOS
CMOS
Complementary metal–oxide–semiconductor is a technology for constructing integrated circuits. CMOS technology is used in microprocessors, microcontrollers, static RAM, and other digital logic circuits...
processor system with the designation of U84C00 was also under development.
The variant UB880 corresponds to the original Z80 processor, the UA880 to a Z80A CPU and the VB880 to a Z80 version with extended temperature specification (-25°C to +85°C) for military and industrial applications. Reproductions of Zilog's peripheral components PIO (U 855), SIO (U 856), CTC (U 857), DMA (direct memory access) (U 858) and DART (U 8563) were also manufactured.